[Bug 105962] [KBL] "enable_rc6" parameter deprecation brings back freezing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105962

--- Comment #19 from Imre Deak <imre.deak at intel.com> ---
(In reply to paulz from comment #16)
> (In reply to paulz from comment #13)
> > > Please also provide a dmesg
> > > log booting with drm.debug=0x1f up to the freeze to double-check what causes
> > > the DC state toggling.
> > i will do that.
> 
> freeze after less then 30 minutes without disabling RC6.
> 
> logfile: https://bugs.freedesktop.org/attachment.cgi?id=139135

Thanks, looks like the only activity preceding the freeze is some periodic GPU
command, I suppose to update the clock in GUI, but nothing out of ordinary. You
could still check if enabling pstore would provide additional logs after freeze
and reboot. For that you'd need to build your kernel with EFI or RAM based
PSTORE support (for EFI: CONFIG_PSTORE=y, CONFIG_EFI_VARS_PSTORE=y) and boot
with the 'nmi_watchdog=panic panic=5' kernel params. After freeze/rebooting

# mount -t pstore none <dir>

should put any such logs in <dir>.

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